jennifer ashton here with the scoop. it seems like every time we turn around, there's something else with bpa. it's terrible. you know, it's the end of the world. what's really going on with the latest bpa discovery? >> the saga continues, erica, and still really more questions than answers. you're right, bpa or this chemical, this bisphenol a. more than 95% of us have traces of it detectable in our urine. this should not be a surprise. this is a study that looked although the bpa compounds in dental sealants because they are used in -- to do good things in our children and actually found that when these sealants combine with saliva, the enzymes in saliva release a bpa by-product detectable in the saliva of children up to three hours after sealants are applied. >> is there enough that's detected or that perhaps would stay with us for it to be a major concern for parents? >> unclear at this point. it's unknown. this study was based on a review of toxicology literature and certainly more research needs to be done. they nee